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11 June 2024 Generation and manipulation of quantum light using bulk nonlinear metamaterials
Ady Arie
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Proceedings Volume PC12990, Metamaterials XIV; PC129900G (2024) https://doi.org/10.1117/12.3017522
Event: SPIE Photonics Europe, 2024, Strasbourg, France
Abstract
In the process of Spontaneous Parametric Down Conversion (SPDC), a pump photon spontaneously splits inside a quadratic nonlinear crystal to signal and idler photons. By spatially modulating the nonlinear coefficient, we form a bulk nonlinear metamaterial that can shape the first and second order correlations of the down-converted signal and idler photons in either the spatial domain or the spectral domains. These degrees of freedom span a multi-dimensional Hilbert space, which is beneficial for quantum information applications. Recently, we have designed and fabricated, using electric field poling, bulk nonlinear metamaterials in KTiOPO4, for generating spatially entangled signal-idler pairs. This includes a bi-photon Bell state in the Hermite-Gauss basis, or a state with 3 dominant pairs of coincidences, approximating a bi-photon qutrit. As for the spectral domain, we generated a variety of quantum states: high purity frequency uncorrelated states, frequency-bin Bell states and frequency entangled bi-photon qudit states. By increasing the pump power, we reach the regime of bright squeezed vacuum sources, enabling the generation of a square cluster state in the frequency domain.
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Ady Arie "Generation and manipulation of quantum light using bulk nonlinear metamaterials", Proc. SPIE PC12990, Metamaterials XIV, PC129900G (11 June 2024); https://doi.org/10.1117/12.3017522
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KEYWORDS
Nonlinear metamaterials
Quantum light
Quantum light generation
Quantum entanglement
Quantum frequencies
Quantum signals
Photonic crystals
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